158 



Tndividnais attain as much as four inches and a half 

 in length. This is a hardy slug ; in the present year 

 [1852] it was crawling about on the 24th of December. 



Arion Flavus [continued from page 50.] 



Not uncommon at the roots of the sedge-grass at 

 High6eld-house, near the lake. I have also found it 

 abundantly amongst moss and lichen, at Chaigeiey 

 Manor, Lancashire. 



PisiDiuM Amnicum [continued from page 12] 



Laterly 1 have dredged this species in abundance in 

 the Trent at Beeston R)'lands. 



UnIO TUMIDUS, UnIO PICTORUM, AND DrEISSENA PoLY- 



MORPHA, &c. [continued from pages 20,22, and 17.] 



The following brief account will prove sufficiently 

 interesting to warrant its being inserted in the 

 " appendix:" — 



At Hooley's Wood, Wollaton, in the old canal, I las^ 

 summer found myriads of Dreisseua polymorpha cling- 

 ing together on the sides of the lock in clusters some 

 inches thick. They were of good size, and some speci- 

 mens were pale and striped with blue. 



There were also fine specimens of Uniopictorum,and 

 exceedingly large ones of Unio tumidus, some measur- 

 ing as much as 3| inches in length. This canal has 

 not been used of late years, and has become stagnant 



